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http://indianaquariumhobbyist.com/community/ :: View topic - MH Lights and Red Plants
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MH Lights and Red Plants

 
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Shankars
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PostPosted: Mon May 03, 2004 12:59 pm Post subject: MH Lights and Red Plants Reply with quote

 Hi  All,
 
 I  find  that  plants  with  red  colored  leaves  are  not  growing  in  my  tank  while  the  others  are  doing  well.  I  use  two  70W  MH  lights  for  my  60-gallon  tank.  Is  there  any  relation  between  MH  lights  and  'red  plants’?  Any  one  who  has  seen  this  problem?
 
 Shankar  
 Chennai
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Madan
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PostPosted: Mon May 03, 2004 1:35 pm Post subject:  Reply with quote

 Which  Red  colour  plants  are  you  having  problems  with?
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beta
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PostPosted: Mon May 03, 2004 1:50 pm Post subject:  Reply with quote

 He's  referring  to  Alternanthera  reineckii  and  Ammania  gracilis.  I  have  also  seen  in  some  of  my  friend's  tanks  that  the  red  plants  are  not  doing  well  under  MH's.  I  think  it  has  something  to  do  with  the  color  spectrum  of  the  MH.
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ravi
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PostPosted: Mon May 03, 2004 2:22 pm Post subject:  Reply with quote

 Hi,
 
 I  can  confirm  that.  Red  plants  don't  like  MH.  Green  plants  love  it.
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Shankars
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PostPosted: Mon May 03, 2004 2:27 pm Post subject:  Reply with quote

                                                   
ravi  wrote:                
Hi,
 
 I  can  confirm  that.  Red  plants  don't  like  MH.  Green  plants  love  it.                

 
 
 Ravi,
 
 What  lights  do  you  use?  Details  please.
 
 Shankar
 Chennai
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ravi
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PostPosted: Mon May 03, 2004 2:50 pm Post subject:  Reply with quote

 Hi  Shankar,
 
 2  x  150  watts  MH  from  Samson  Lighting.  Lights  on  for  12  hours  from  10  am  to  10  pm.
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Madan
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PostPosted: Mon May 03, 2004 6:10 pm Post subject:  Reply with quote

 How  about  reducing  the  nitrates  in  the  tank  and  increasing  the  phosphates.
 Careful  about  adding  too  much  phosphates.  A  nitrate:phosphate  ratio  of  1:10  will  be  ideal,  but  difficult  to  acheive  accurately.
 
 I  have  had  Eustrallis  stellata  look  beautiful  under  these  conditions  with  MH.
 As  also  Ammanian  gracialis,  right  under  an  MH.
 
 With  high  lighting  the  dosing  regimen  is  a  different  ball  game  which  has  to  be  constantly  fine  tuned.  Look  for  feed  back  from  your  plants  and  act  quickly  and  carefully.
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nimmat
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PostPosted: Thu Aug 05, 2004 9:04 pm Post subject:  Reply with quote

 Guys,
 
 I  would  have  thought  the  other  way  round.  MH  of  higher  temperature  (10000k  and  around)  should  promote  Red  plants.  Simply  for  the  reason  that  their  light  is  more  towards  the  blue  spectrum  that  can  be  easily  absorbed  by  the  red  plants.  
 
 However,  I  have  also  read  that  low  watt  MH  (75w  ones)  are  not  normally  of  higher  temperature  and  if  they  are  built  of  higher  temperature  specifically,  then  a  majority  of  the  light  is  blocked  by  the  glass  filters  to  allow  the  correct  temperature  light  to  pass  through.  I  could  be  wrong,  but  my  experience  with  red  plants  has  been  that  they  do  exceptionally  well  in  high  temperature  lights  like  Marine  whites  or  10,000k  bulbs  (could  be  MH,  T8  or  T5).  A  5000k  MH  may  not  be  able  to  give  red  plants  anything  they  need  and  hence  suffer.
 
 Regards,
 Nimish
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Madan
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PostPosted: Thu Aug 05, 2004 11:55 pm Post subject:  Reply with quote

 Takashi  Amano  uses  8000K  lights.  Lesser  mortals  settle  for  5000K  or  6500K  lights.  
 Some  people  have  excellent  growth/color  on  their  Red  plants  with  6500K  tube  lights.  
 10000K  lighting????  Rolling Eyes    Have  you  tried  them?  How  do  the  other  green  plants  do  under  this  light?
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venket
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PostPosted: Fri Aug 06, 2004 9:59 am Post subject:  Reply with quote

 Hi  Guys,
 
 not  sure  of  the  MH  aspect,  but  my  tank  has  some  red  plants  that  are  thriving  well  with  6000k  osram  bulbs.  I  was  using  Phillips  Truelite  for  all  these  years  and  still  did  not  find  any  problems  in  raising  redplants.
 
 Regards
 
 Venket
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trevor
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PostPosted: Sat Aug 07, 2004 2:54 pm Post subject: Red plants Reply with quote

 Hi  Venkat,
                         Several  planted  aquariums  use  the  Phillips  trulite.I  have  not  come  across  anyone  whose  red  plants  suffer  because  of  them.Unless  of  course  if  the  tank  is  too  deep  for  the  light  to  penetrate  or  if  the  taller  plants  block  the  light  to  the  lower  ones.The  Phillips  trulite  is  one  of  the  most  simple  and  economical  ways  to  grow  nearly  all  types  of  plants  especially  for  the  beginner.
                       Regards
                               Trevor
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